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                        多线程
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                            <b>0.1.</b>
                        
                        多线程
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                            <b>0.2.</b>
                        
                        pthread
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                            <b>0.3.</b>
                        
                        NSThread
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                            <b>0.3.1.</b>
                        
                        创建线程的方式
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                            <b>0.3.2.</b>
                        
                        NSThread 的 Target
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                            <b>0.3.3.</b>
                        
                        线程状态
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                            <b>0.3.4.</b>
                        
                        线程属性
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                            <b>0.3.5.</b>
                        
                        资源共享
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                            <b>0.3.6.</b>
                        
                        原子属性
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                            <b>0.3.7.</b>
                        
                        线程间通讯
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                            <b>0.4.</b>
                        
                        GCD
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                            <b>0.4.1.</b>
                        
                        同步 &amp; 异步
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                            <b>0.4.2.</b>
                        
                        block
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                            <b>0.4.3.</b>
                        
                        GCD 常用代码
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                            <b>0.4.4.</b>
                        
                        串行队列
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                            <b>0.4.5.</b>
                        
                        并发队列
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                            <b>0.4.6.</b>
                        
                        主队列
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                            <b>0.4.7.</b>
                        
                        同步任务的作用
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                            <b>0.4.8.</b>
                        
                        Barrier 异步
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                            <b>0.4.9.</b>
                        
                        全局队列
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                            <b>0.4.10.</b>
                        
                        延迟操作
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                            <b>0.4.11.</b>
                        
                        一次性执行
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                            <b>0.4.12.</b>
                        
                        调度组
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                            <b>0.5.</b>
                        
                        NSOperation
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                            <b>0.5.1.</b>
                        
                        基本演练
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                            <b>0.5.2.</b>
                        
                        高级演练
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                            <b>0.5.3.</b>
                        
                        与 GCD 的对比
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                            <b>0.5.4.</b>
                        
                        自定义操作
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                            <b>0.6.</b>
                        
                        异步加载图片
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                            <b>0.6.1.</b>
                        
                        搭建界面&amp;数据准备
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                            <b>0.6.2.</b>
                        
                        同步加载图像
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                            <b>0.6.3.</b>
                        
                        异步加载图像
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                            <b>0.6.4.</b>
                        
                        占位图像
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                            <b>0.6.5.</b>
                        
                        MVC
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                            <b>0.6.6.</b>
                        
                        操作缓冲池
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                            <b>0.6.7.</b>
                        
                        图像缓冲池
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                            <b>0.6.8.</b>
                        
                        代码重构
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                            <b>0.6.9.</b>
                        
                        内存警告
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                            <b>0.6.10.</b>
                        
                        黑名单
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                            <b>0.6.11.</b>
                        
                        沙盒缓存
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                            <b>0.6.12.</b>
                        
                        小结
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                            <b>0.6.13.</b>
                        
                        SDWebImage初体验
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                            <b>0.7.</b>
                        
                        仿SDWebImage
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                            <b>0.7.1.</b>
                        
                        下载操作
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                            <b>0.7.2.</b>
                        
                        测试下载操作
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                            <b>0.7.3.</b>
                        
                        下载管理器
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                            <b>0.7.4.</b>
                        
                        自定义 UIImageView
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                            <b>0.8.</b>
                        
                        SDWebImage
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                            <b>0.8.1.</b>
                        
                        第三方框架
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                            <b>0.8.2.</b>
                        
                        位移枚举
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                            <b>0.8.3.</b>
                        
                        NSCache
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                            <b>0.8.4.</b>
                        
                        SDWebImage常见面试题
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                            <b>0.9.</b>
                        
                        runloop
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                            <b>0.10.</b>
                        
                        自动释放池
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    <h1>
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        <a href="./" >多线程</a>
    </h1>
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                        <h1 id="%E7%BA%BF%E7%A8%8B%E7%8A%B6%E6%80%81">&#x7EBF;&#x7A0B;&#x72B6;&#x6001;</h1>
<h2 id="%E7%BA%BF%E7%A8%8B%E7%8A%B6%E6%80%81">&#x7EBF;&#x7A0B;&#x72B6;&#x6001;</h2>
<ul>
<li><code>&#x65B0;&#x5EFA;</code><ul>
<li>&#x5B9E;&#x4F8B;&#x5316;&#x7EBF;&#x7A0B;&#x5BF9;&#x8C61;</li>
</ul>
</li>
<li><code>&#x5C31;&#x7EEA;</code><ul>
<li>&#x5411;&#x7EBF;&#x7A0B;&#x5BF9;&#x8C61;&#x53D1;&#x9001; <code>start</code> &#x6D88;&#x606F;&#xFF0C;&#x7EBF;&#x7A0B;&#x5BF9;&#x8C61;&#x88AB;&#x52A0;&#x5165; <code>&#x53EF;&#x8C03;&#x5EA6;&#x7EBF;&#x7A0B;&#x6C60;</code> &#x7B49;&#x5F85; CPU &#x8C03;&#x5EA6;</li>
<li><code>detach</code> &#x65B9;&#x6CD5;&#x548C; <code>performSelectorInBackground</code> &#x65B9;&#x6CD5;&#x4F1A;&#x76F4;&#x63A5;&#x5B9E;&#x4F8B;&#x5316;&#x4E00;&#x4E2A;&#x7EBF;&#x7A0B;&#x5BF9;&#x8C61;&#x5E76;&#x52A0;&#x5165; <code>&#x53EF;&#x8C03;&#x5EA6;&#x7EBF;&#x7A0B;&#x6C60;</code></li>
</ul>
</li>
<li><code>&#x8FD0;&#x884C;</code><ul>
<li>CPU &#x8D1F;&#x8D23;&#x8C03;&#x5EA6;<code>&#x53EF;&#x8C03;&#x5EA6;&#x7EBF;&#x7A0B;&#x6C60;</code>&#x4E2D;&#x7EBF;&#x7A0B;&#x7684;&#x6267;&#x884C;</li>
<li>&#x7EBF;&#x7A0B;&#x6267;&#x884C;&#x5B8C;&#x6210;&#x4E4B;&#x524D;&#xFF0C;&#x72B6;&#x6001;&#x53EF;&#x80FD;&#x4F1A;&#x5728;<code>&#x5C31;&#x7EEA;</code>&#x548C;<code>&#x8FD0;&#x884C;</code>&#x4E4B;&#x95F4;&#x6765;&#x56DE;&#x5207;&#x6362;</li>
<li><code>&#x5C31;&#x7EEA;</code>&#x548C;<code>&#x8FD0;&#x884C;</code>&#x4E4B;&#x95F4;&#x7684;&#x72B6;&#x6001;&#x53D8;&#x5316;&#x7531; CPU &#x8D1F;&#x8D23;&#xFF0C;&#x7A0B;&#x5E8F;&#x5458;&#x4E0D;&#x80FD;&#x5E72;&#x9884;</li>
</ul>
</li>
<li><code>&#x963B;&#x585E;</code><ul>
<li>&#x5F53;&#x6EE1;&#x8DB3;&#x67D0;&#x4E2A;&#x9884;&#x5B9A;&#x6761;&#x4EF6;&#x65F6;&#xFF0C;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x4F11;&#x7720;&#x6216;&#x9501;&#x963B;&#x585E;&#x7EBF;&#x7A0B;&#x6267;&#x884C;<ul>
<li><code>sleepForTimeInterval</code>&#xFF1A;&#x4F11;&#x7720;&#x6307;&#x5B9A;&#x65F6;&#x957F;</li>
<li><code>sleepUntilDate</code>&#xFF1A;&#x4F11;&#x7720;&#x5230;&#x6307;&#x5B9A;&#x65E5;&#x671F;</li>
<li><code>@synchronized(self)</code>&#xFF1A;&#x4E4E;&#x65A5;&#x9501;</li>
</ul>
</li>
</ul>
</li>
<li><code>&#x6B7B;&#x4EA1;</code><ul>
<li>&#x6B63;&#x5E38;&#x6B7B;&#x4EA1;<ul>
<li>&#x7EBF;&#x7A0B;&#x6267;&#x884C;&#x5B8C;&#x6BD5;</li>
</ul>
</li>
<li>&#x975E;&#x6B63;&#x5E38;&#x6B7B;&#x4EA1;<ul>
<li>&#x5F53;&#x6EE1;&#x8DB3;&#x67D0;&#x4E2A;&#x6761;&#x4EF6;&#x540E;&#xFF0C;&#x5728;&#x7EBF;&#x7A0B;&#x5185;&#x90E8;&#x4E2D;&#x6B62;&#x6267;&#x884C;</li>
<li>&#x5F53;&#x6EE1;&#x8DB3;&#x67D0;&#x4E2A;&#x6761;&#x4EF6;&#x540E;&#xFF0C;&#x5728;&#x4E3B;&#x7EBF;&#x7A0B;&#x4E2D;&#x6B62;&#x7EBF;&#x7A0B;&#x5BF9;&#x8C61;</li>
</ul>
</li>
</ul>
</li>
</ul>
<h2 id="%E4%BB%A3%E7%A0%81%E6%BC%94%E7%BB%83">&#x4EE3;&#x7801;&#x6F14;&#x7EC3;</h2>
<pre><code class="lang-objc">- (<span class="hljs-keyword">void</span>)statusDemo {

    <span class="hljs-built_in">NSLog</span>(<span class="hljs-string">@&quot;&#x5148;&#x7761;&#x4F1A;&quot;</span>);
    [<span class="hljs-built_in">NSThread</span> sleepForTimeInterval:<span class="hljs-number">1.0</span>];

    <span class="hljs-keyword">for</span> (<span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span>; i &lt; <span class="hljs-number">20</span>; i++) {
        <span class="hljs-keyword">if</span> (i == <span class="hljs-number">9</span>) {
            <span class="hljs-built_in">NSLog</span>(<span class="hljs-string">@&quot;&#x518D;&#x7761;&#x4F1A;&quot;</span>);
            [<span class="hljs-built_in">NSThread</span> sleepUntilDate:[<span class="hljs-built_in">NSDate</span> dateWithTimeIntervalSinceNow:<span class="hljs-number">1.0</span>]];
        }

        <span class="hljs-built_in">NSLog</span>(<span class="hljs-string">@&quot;%d %@&quot;</span>, i, [<span class="hljs-built_in">NSThread</span> currentThread]);

        <span class="hljs-keyword">if</span> (i == <span class="hljs-number">16</span>) {
            <span class="hljs-built_in">NSLog</span>(<span class="hljs-string">@&quot;88&quot;</span>);
            <span class="hljs-comment">// &#x7EC8;&#x6B62;&#x7EBF;&#x7A0B;&#x4E4B;&#x524D;&#xFF0C;&#x9700;&#x8981;&#x8BB0;&#x4F4F;&#x91CA;&#x653E;&#x8D44;&#x6E90;</span>
            [<span class="hljs-built_in">NSThread</span> exit];
        }
    }
    <span class="hljs-built_in">NSLog</span>(<span class="hljs-string">@&quot;over&quot;</span>);
}
</code></pre>
<pre><code class="lang-objc">- (<span class="hljs-keyword">void</span>)touchesBegan:(<span class="hljs-built_in">NSSet</span> *)touches withEvent:(UIEvent *)event {
    <span class="hljs-comment">// &#x6CE8;&#x610F;&#x4E0D;&#x8981;&#x5728;&#x4E3B;&#x7EBF;&#x7A0B;&#x4E0A;&#x8C03;&#x7528; exit &#x65B9;&#x6CD5;</span>
<span class="hljs-comment">//    [NSThread exit];</span>

    <span class="hljs-comment">// &#x5B9E;&#x4F8B;&#x5316;&#x7EBF;&#x7A0B;&#x5BF9;&#x8C61;(&#x65B0;&#x5EFA;)</span>
    <span class="hljs-built_in">NSThread</span> *t = [[<span class="hljs-built_in">NSThread</span> alloc] initWithTarget:<span class="hljs-keyword">self</span> selector:<span class="hljs-keyword">@selector</span>(statusDemo) object:<span class="hljs-literal">nil</span>];

    <span class="hljs-comment">// &#x7EBF;&#x7A0B;&#x5C31;&#x7EEA;(&#x88AB;&#x6DFB;&#x52A0;&#x5230;&#x53EF;&#x8C03;&#x5EA6;&#x7EBF;&#x7A0B;&#x6C60;&#x4E2D;)</span>
    [t start];
}
</code></pre>
<h3 id="%E4%BB%A3%E7%A0%81%E5%B0%8F%E7%BB%93">&#x4EE3;&#x7801;&#x5C0F;&#x7ED3;</h3>
<h4 id="%E9%98%BB%E5%A1%9E">&#x963B;&#x585E;</h4>
<ul>
<li><p>&#x65B9;&#x6CD5;&#x6267;&#x884C;&#x8FC7;&#x7A0B;&#xFF0C;&#x7B26;&#x5408;&#x67D0;&#x4E00;&#x6761;&#x4EF6;&#x65F6;&#xFF0C;&#x53EF;&#x4EE5;&#x5229;&#x7528; <code>sleep</code> &#x65B9;&#x6CD5;&#x8BA9;&#x7EBF;&#x7A0B;&#x8FDB;&#x5165; <code>&#x963B;&#x585E;</code> &#x72B6;&#x6001;</p>
<ul>
<li><code>sleepForTimeInterval</code> &#x4ECE;&#x73B0;&#x5728;&#x8D77;&#x7761;&#x591A;&#x5C11;<code>&#x79D2;</code></li>
<li><code>sleepUntilDate</code> &#x4ECE;&#x73B0;&#x5728;&#x8D77;&#x7761;&#x5230;&#x6307;&#x5B9A;&#x7684;&#x65E5;&#x671F;</li>
</ul>
</li>
</ul>
<h4 id="%E6%AD%BB%E4%BA%A1">&#x6B7B;&#x4EA1;</h4>
<pre><code class="lang-objc">[<span class="hljs-built_in">NSThread</span> exit];
</code></pre>
<ul>
<li>&#x4E00;&#x65E6;&#x5F3A;&#x884C;&#x7EC8;&#x6B62;&#x7EBF;&#x7A0B;&#xFF0C;&#x540E;&#x7EED;&#x7684;&#x6240;&#x6709;&#x4EE3;&#x7801;&#x90FD;&#x4E0D;&#x4F1A;&#x88AB;&#x6267;&#x884C;</li>
<li><strong>&#x6CE8;&#x610F;&#xFF1A;&#x5728;&#x7EC8;&#x6B62;&#x7EBF;&#x7A0B;&#x4E4B;&#x524D;&#xFF0C;&#x5E94;&#x8BE5;&#x6CE8;&#x610F;&#x91CA;&#x653E;&#x4E4B;&#x524D;&#x5206;&#x914D;&#x7684;&#x5BF9;&#x8C61;&#xFF01;</strong></li>
</ul>
<blockquote>
<p>&#x6CE8;&#x610F;&#xFF1A;&#x7EBF;&#x7A0B;&#x4ECE;<code>&#x5C31;&#x7EEA;</code>&#x548C;<code>&#x8FD0;&#x884C;</code>&#x72B6;&#x6001;&#x4E4B;&#x95F4;&#x7684;&#x5207;&#x6362;&#x662F;&#x7531; <code>CPU</code> &#x8D1F;&#x8D23;&#x7684;&#xFF0C;&#x7A0B;&#x5E8F;&#x5458;&#x65E0;&#x6CD5;&#x5E72;&#x9884;</p>
</blockquote>

                    
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